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Ford 9N, 2N & 8N Discussion Forum
Show Parts for Model:

IGNITION RESISTOR BURNING UP

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Falcon

06-24-2013 07:45:59




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I recently installed an electronic ignition assembly on my 9N with front mount distributor. I also replaced cap, rotor button, plug wires & plugs at same time. It ran great for a couple of weeks (probably 7 to 8 hours total run time) then the ignition resistor went out, it was extremely hot to the touch. I installed a new one and the tractor cranked up and ran for about 5 minutes, then quit. The new resistor was also extremely hot and when I tested it it showed no resistance. I decided to check the coil and it shows no resistance between top post and spring on bottom. The tractor was converted to 12V before I got it so I don"t know if the coil is 6V or 12V. Shouldn"t there be some resistance between these two points on the coil? If the coil is bad and I need a new one I will probably get the 12V coil for it. If I do install a 12V coil do I still need a resistor in line? I checked behind the dash and did not see any other resistors in the wiring.

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JMOR

06-24-2013 08:27:12




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 Re: IGNITION RESISTOR BURNING UP in reply to Falcon, 06-24-2013 07:45:59  
What do you mean by "shows no resistance"? Ordinarily, in the electrical/electronics world, such a statement means that the resistance is ZERO Ohms, i.e., a really good heavy copper wire of short length. What does it mean to you?

Both the coil primary & the resistor will be so near to ZERO, that many persons do no recognize what they are reading or the sorry instrument/techniques make it near impossible for them to obtain an accurate measurement. Your EI mfgr. specifies a minimum combined coil + resistor value of 3 Ohms. The resistor can show a red color & ignite a piece of paper when touched, so keep in mind that it is normal for it to be far too hot to touch, unless you enjoy pain & the smell of burning flesh.

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Falcon

06-24-2013 09:03:59




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 Re: IGNITION RESISTOR BURNING UP in reply to JMOR, 06-24-2013 08:27:12  
I have a quality digital ohm meter. When I said zero resistance I meant the same as touching the two leads of the meter together. 0 ohms.



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JMOR

06-24-2013 09:11:18




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 Re: IGNITION RESISTOR BURNING UP in reply to Falcon, 06-24-2013 09:03:59  
Quoting Removed, click Modern View to seeNot the way it should be. The coils are generally around 0.5 to 1.5 Ohms if 6v and about 2.5 Ohms if 12v.

The standard Ford 12250 resistor is ~0.4 Ohm cold and ~1.7 Ohms when red hot.



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Falcon

06-24-2013 09:45:42




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 Re: IGNITION RESISTOR BURNING UP in reply to JMOR, 06-24-2013 09:11:18  
Thanks for the info. I assume then that my coil is bad if it is reading 0.00 ohms. I guess I will be replacing with a 12V coil. Do I still need any type of resistor with a 12V coil?



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JMOR

06-24-2013 09:52:07




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 Re: IGNITION RESISTOR BURNING UP in reply to Falcon, 06-24-2013 09:45:42  
Quoting Removed, click Modern View to seeYes. Remember I said that Pertronix specifies 3 Ohm minimum for coil + resistor combination? Well, 3 - 2.5 = 0.5, so......use the Ford 12250 resistor.



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Falcon

06-24-2013 10:29:22




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 Re: IGNITION RESISTOR BURNING UP in reply to JMOR, 06-24-2013 09:52:07  
Thanks for your help Jmor, I just ordered the 2 parts. I'll let you know how it works out.



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JMOR

06-24-2013 10:37:06




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 Re: IGNITION RESISTOR BURNING UP in reply to Falcon, 06-24-2013 10:29:22  
Quoting Removed, click Modern View to seeAppreciate feedback. Might try Ohmmeter on the new parts when they arrive, too.



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soundguy

06-24-2013 08:23:39




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 Re: IGNITION RESISTOR BURNING UP in reply to Falcon, 06-24-2013 07:45:59  
wow.. this post is a mess.

1, I'd consult twith the maker of your high dollar e-ignition unit and find out what they reccomend.. since doing the wrong thing can burn up that module.



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36 coupe

06-26-2013 04:09:10




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 Re: IGNITION RESISTOR BURNING UP in reply to soundguy, 06-24-2013 08:23:39  
I suspect it is already cooked.



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soundguy

06-26-2013 04:43:14




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 Re: IGNITION RESISTOR BURNING UP in reply to 36 coupe, 06-26-2013 04:09:10  
may very well be!



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